Filtering Data Feed for Viz Bar Chart

Hello Everyone,

I am having trouble getting data to display in a bar chart so that it can be filtered by country. If I could figure out how to get the bar chart to show the data for one country at a time I should be able to create a way for users to select which country they want to see.

Here is a screen shot of how the bar chart looks now. Notice how there are 4 bars overlapping for each year. Is it possible to filter the data into the chart without changing the data format (json)?